21220221020012 has 24 divisors (see below), whose sum is σ = 42457786043904. Its totient is φ = 9090663864912.

The previous prime is 21220221019997. The next prime is 21220221020143. The reversal of 21220221020012 is 21002012202212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154787438 + ... + 154924469.

It is an arithmetic number, because the mean of its divisors is an integer number (1769074418496).

Almost surely, 2^{21220221020012} is an apocalyptic number.

It is an amenable number.

21220221020012 is an abundant number, since it is smaller than the sum of its proper divisors (21237565023892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21220221020012 is a wasteful number, since it uses less digits than its factorization.

21220221020012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309714365 (or 309714363 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21220221020012 its reverse (21002012202212), we get a palindrome (42222233222224).

The spelling of 21220221020012 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, twenty thousand, twelve".